diff options
Diffstat (limited to 'Userland/Libraries/LibGfx/ICCProfile.cpp')
| -rw-r--r-- | Userland/Libraries/LibGfx/ICCProfile.cpp | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/Userland/Libraries/LibGfx/ICCProfile.cpp b/Userland/Libraries/LibGfx/ICCProfile.cpp index 9d807fecd0..fc703f72cc 100644 --- a/Userland/Libraries/LibGfx/ICCProfile.cpp +++ b/Userland/Libraries/LibGfx/ICCProfile.cpp @@ -116,6 +116,25 @@ struct ICCHeader { }; static_assert(sizeof(ICCHeader) == 128); +Optional<PreferredCMMType> parse_preferred_cmm_type(ICCHeader const& header) +{ + // ICC v4, 7.2.3 Preferred CMM type field + + // "This field may be used to identify the preferred CMM to be used. + // If used, it shall match a CMM type signature registered in the ICC Tag Registry" + // https://www.color.org/signatures2.xalter currently links to + // https://www.color.org/registry/signature/TagRegistry-2021-03.pdf, which contains + // some CMM signatures. + // This requirement is often honored in practice, but not always. For example, + // JPEGs exported in Adobe Lightroom contain profiles that set this to 'Lino', + // which is not present in the "CMM Signatures" table in that PDF. + + // "If no preferred CMM is identified, this field shall be set to zero (00000000h)." + if (header.preferred_cmm_type == 0) + return {}; + return PreferredCMMType { header.preferred_cmm_type }; +} + ErrorOr<Version> parse_version(ICCHeader const& header) { // ICC v4, 7.2.4 Profile version field @@ -217,6 +236,38 @@ ErrorOr<void> parse_file_signature(ICCHeader const& header) return {}; } +Optional<DeviceManufacturer> parse_device_manufacturer(ICCHeader const& header) +{ + // ICC v4, 7.2.12 Device manufacturer field + // "This field may be used to identify a device manufacturer. + // If used the signature shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org" + // Device manufacturers can be looked up at https://www.color.org/signatureRegistry/index.xalter + // For example: https://www.color.org/signatureRegistry/?entityEntry=APPL-4150504C + // Some icc files use codes not in that registry. For example. D50_XYZ.icc from https://www.color.org/XYZprofiles.xalter + // has its device manufacturer set to 'none', but https://www.color.org/signatureRegistry/?entityEntry=none-6E6F6E65 does not exist. + + // "If not used this field shall be set to zero (00000000h)." + if (header.device_manufacturer == 0) + return {}; + return DeviceManufacturer { header.device_manufacturer }; +} + +Optional<DeviceModel> parse_device_model(ICCHeader const& header) +{ + // ICC v4, 7.2.13 Device model field + // "This field may be used to identify a device model. + // If used the signature shall match the signature contained in the appropriate section of the ICC signature registry found at www.color.org" + // Device models can be looked up at https://www.color.org/signatureRegistry/deviceRegistry/index.xalter + // For example: https://www.color.org/signatureRegistry/deviceRegistry/?entityEntry=7FD8-37464438 + // Some icc files use codes not in that registry. For example. D50_XYZ.icc from https://www.color.org/XYZprofiles.xalter + // has its device model set to 'none', but https://www.color.org/signatureRegistry/deviceRegistry?entityEntry=none-6E6F6E65 does not exist. + + // "If not used this field shall be set to zero (00000000h)." + if (header.device_model == 0) + return {}; + return DeviceModel { header.device_model }; +} + ErrorOr<RenderingIntent> parse_rendering_intent(ICCHeader const& header) { // ICC v4, 7.2.15 Rendering intent field @@ -245,6 +296,20 @@ ErrorOr<XYZ> parse_pcs_illuminant(ICCHeader const& header) return xyz; } +Optional<Creator> parse_profile_creator(ICCHeader const& header) +{ + // ICC v4, 7.2.17 Profile creator field + // "This field may be used to identify the creator of the profile. + // If used the signature should match the signature contained in the device manufacturer section of the ICC signature registry found at www.color.org." + // This is not always true in practice. + // For example, .icc files in /System/ColorSync/Profiles on macOS 12.6 set this to 'appl', which is a CMM signature, not a device signature (that one would be 'APPL'). + + // "If not used this field shall be set to zero (00000000h)." + if (header.profile_creator == 0) + return {}; + return Creator { header.profile_creator }; +} + template<size_t N> bool all_bytes_are_zero(const u8 (&bytes)[N]) { @@ -410,15 +475,19 @@ ErrorOr<NonnullRefPtr<Profile>> Profile::try_load_from_externally_owned_memory(R auto header = *bit_cast<ICCHeader const*>(bytes.data()); TRY(parse_file_signature(header)); + profile->m_preferred_cmm_type = parse_preferred_cmm_type(header); profile->m_version = TRY(parse_version(header)); profile->m_device_class = TRY(parse_device_class(header)); profile->m_data_color_space = TRY(parse_data_color_space(header)); profile->m_connection_space = TRY(parse_connection_space(header)); profile->m_creation_timestamp = TRY(parse_creation_date_time(header)); profile->m_flags = Flags { header.profile_flags }; + profile->m_device_manufacturer = parse_device_manufacturer(header); + profile->m_device_model = parse_device_model(header); profile->m_device_attributes = TRY(parse_device_attributes(header)); profile->m_rendering_intent = TRY(parse_rendering_intent(header)); profile->m_pcs_illuminant = TRY(parse_pcs_illuminant(header)); + profile->m_creator = parse_profile_creator(header); profile->m_id = TRY(parse_profile_id(header, bytes)); TRY(parse_reserved(header)); |